Moved SCL parser generator to platform repository.

[simantics/platform.git] / bundles / org.simantics.scl.compiler / src / org / simantics / scl / compiler / parser / grammar / Grammar.java

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/parser/grammar/Grammar.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/parser/grammar/Grammar.java
new file mode 100644 (file)
index 0000000..e80858c
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/parser/grammar/Grammar.java
@@ -0,0 +1,46 @@
+package org.simantics.scl.compiler.parser.grammar;
+
+import org.simantics.scl.compiler.parser.regexp.Namer;
+
+public class Grammar implements Namer {
+    public final Production[] productions;
+    public final String[] terminalNames;
+    public final String[] nonterminalNames;
+    public final int[] initialNonterminals;
+    
+    public Grammar(Production[] productions, String[] terminalNames,
+            String[] nonterminalNames, int[] initialNonterminals) {
+        this.productions = productions;
+        this.terminalNames = terminalNames;
+        this.nonterminalNames = nonterminalNames;
+        this.initialNonterminals = initialNonterminals;
+    }
+
+    public String getName(int symbolId) {
+        if(symbolId >= 0)
+            return terminalNames[symbolId];
+        else
+            return nonterminalNames[~symbolId];
+    }
+    
+    @Override
+    public String toString() {
+        StringBuilder b = new StringBuilder();
+        for(Production prod : productions) {
+            b.append(prod.toString(this));
+            b.append("\n");
+        }
+        /*for(int i=0;i<terminalNames.length;++i)
+            b.append(terminalNames[i]).append(' ').append(i).append('\n');*/
+        return b.toString();
+    }
+
+    public void check() {
+        int[] prodCount = new int[nonterminalNames.length];
+        for(Production prod : productions)
+            ++prodCount[~prod.lhs];
+        for(int i=0;i<nonterminalNames.length;++i)
+            if(prodCount[i]==0)
+                System.err.println("Nonterminal " + nonterminalNames[i] + " does not have productions.");
+    }
+}